A STUDY ON THE MORPHOLOGY AND VARIATIONS OF BICEPS BRACHI IN HUMAN CADAVERS

Introduction: Biceps brachii is the functionally important muscle of front of the arm. As the name indicates biceps brachii has two heads of origin and inserts on the posterior surface of radial tuberosity. Variations may be present in the form of additional heads at the origin or they may be present at its insertion. These variations may affect action of muscle and may cause compression of nearby neurovascular structures. Aim: To determine the Morphology and variation in anatomy of biceps brachii with respect to its origin, insertion, length, width and distance of union of heads and its nerve supply. Materials and Methods: The present study was conducted on 30 bodies 60 arms each of embalmed cadavers (including both right and left) of Department of Anatomy, Govt. Siddartha Medical College, Andhra Pradesh, India from 2019-2022. The dissection of arm was done according to standard guidelines and biceps brachii muscle was cleaned. The origin, insertion, length, width and nerve supply of biceps brachii muscle was observed and noted for any variation. Results: In the present study an additional head of origin of biceps on right and left side of a cadaver were found. In present study there were variations in length and breadth of the muscle, mostly due to stature and occupation all these were noted. Nerve supply-variations were also noted.Absent MCN was observed in 2 cadavers only on one side of limb both on right side. Its distribution is carried out by Median nerve. Conclusion: There are several variations seen in biceps brachii in way of origin, insertion, nerve supply which can put a surgeon in dilemma and it may result in iatrogenic injuries. Hence, it is important to have a knowledge about its variations so that such injuries can be prevented.